Pressing die

Abstract

The hold-down die includes a lower die and an upper die that crimp the crimp terminal to the electric wire. For example, the lower mold protruding part is formed in the lower mold concave part in a manner that a part is continuous with the first inner surface closest to the lower mold indentation part, and the lower mold groove part is formed in the lower mold protruding part in a manner that a part is open at the first outer surface closest to the lower mold indentation part. The lower mold protruding portion is engaged with the upper mold groove portion when the lower mold concave portion is engaged with the upper mold convex portion, and the upper mold protruding portion is engaged with the lower mold groove portion when the upper mold concave portion is engaged with the lower mold convex portion. For example, a first starting point position, which is a position closest to the lower mold surface, of the lower mold protrusion is included in a height range corresponding to the depth from the lower mold surface to the lower mold indentation bottom surface.

Description

Technical Field

[0001] The invention relates to a pressing die. Background Art

[0002] JP2022-42683A discloses a technology related to a clamping mold, which includes a lower mold and an upper mold, each of which has: a retracted portion in contact with a crimping forming portion, a recessed portion adjacent to one end of the retracted portion in a width direction, and a convex portion adjacent to the other end of the retracted portion in the width direction. Summary of the invention

[0003] Technical problem that the invention aims to solve

[0004] Conventionally, there is a terminal crimping device for manufacturing a wire with a terminal by crimping a crimping forming portion of a crimping terminal to the end of the wire. Generally, in the terminal crimping device, a pressing die including a lower die and an upper die is used, and the lower die and the upper die are held so as to freely approach and separate from each other in the vertical direction, and when approaching each other, the crimping forming portion is plastically deformed to form the crimping portion.

[0005] For example, when a closed barrel type crimping terminal is crimped to an electric wire, burrs may be generated at or around the crimping portion. When such burrs are generated, the outer shape of the crimping portion is generally larger than when no burrs are generated, so when the crimping terminal is inserted into a cavity provided in a housing, there is a possibility of unwanted interference with the cavity.

[0006] Therefore, JP2022-42683A discloses a technology related to a clamping die, which includes a lower die and an upper die, and the lower die and the upper die respectively have: a retracted portion in contact with a crimping forming portion, a concave portion adjacent to one end in the width direction of the retracted portion, and a convex portion adjacent to the other end in the width direction of the retracted portion. In addition, the width direction here is assumed to be a direction orthogonal to the front-to-back direction along the axial direction of the crimping forming portion. In the clamping die, in a state where the crimping forming portion is placed on the retracted portion of the lower die, if the lower die is close to the upper die, the convex portion of the lower die is engaged with the concave portion of the upper die, and the convex portion of the upper die is engaged with the concave portion of the lower die. In addition, the retracted portion of the lower die and the retracted portion of the upper die form a crimping portion by pressing the crimping forming portion in a state where the convex portions of the two ends located in the width direction are clamped to each other. At this time, each convex portion restricts the plastic deformation of the crimping forming portion so as to extend in the width direction, thereby suppressing the generation of burrs in the crimping portion and suppressing the crimping terminal from being inserted into the crimping die.

[0007] In the clamping die disclosed in JP2022-42683A, there are recesses adjacent to the indentation in both the lower die and the upper die. Therefore, whenever the terminal crimping device manufactures an electric wire with a terminal, that is, whenever the indentation of the lower die and the indentation of the upper die press the crimping forming portion to form the crimping portion, stress is easily concentrated on the portion of the indentation near the recess. Therefore, in the case where fatigue failure occurs early in the clamping die due to such stress concentration, the life of the clamping die may also be shortened.

[0008] The present invention has been made in view of all the problems of the prior art. In addition, an object of the present invention is to provide a clamping die that is useful for extending the life of the die.

[0009] Technical solutions to the problem

[0010] The clamping mold of one embodiment of the present invention comprises a lower mold and an upper mold, and when the lower mold and the upper mold approach each other in the up-down direction, the crimping forming part of the crimping terminal is crimped to the electric wire, the lower mold and the upper mold are respectively rectangular parallelepiped with a cross section on a horizontal plane defined in the front-to-back direction and the width direction perpendicular to the front-to-back direction, the front-to-back direction is consistent with the axial direction of the crimping forming part, and the lower mold and the upper mold respectively have: a retracted part, which is arranged in a concave part, the concave part is formed on one side of the mold surface facing the crimping direction, the retracted part makes the crimping forming part contact with the crimping forming part in a state along the front-to-back direction; a concave part, which is adjacent to one end of the retracted part in the width direction, and extends from the mold surface to the direction perpendicular to the crimping direction. The mold is formed in the opposite direction; a convex portion, which is adjacent to the other end of the indentation in the width direction and protrudes from the mold surface in the crimping direction; a protrusion, which is formed in the concave portion in a manner that a portion is continuous with the inner surface closest to the indentation; and a groove portion, which is formed in the convex portion in a manner that a portion is open on the outer surface closest to the indentation, when the concave portion of the lower mold is engaged with the convex portion of the upper mold, the protrusion of the lower mold is engaged with the groove portion of the upper mold, and when the concave portion of the upper mold is engaged with the convex portion of the lower mold, the protrusion of the upper mold is engaged with the groove portion of the lower mold, and the position of the protrusion closest to the mold surface, that is, the starting point position, is contained in the height range corresponding to the depth from the mold surface to the indentation bottom surface of the indentation.

[0011] The protruding portion may be included in a width range corresponding to the width of the setback portion in the front-rear direction.

[0012] It can also be that the protrusion has a first inclined surface, which moves away from the inner surface closest to the indentation portion as it moves from the starting position toward the bottom surface of the recess, and the groove has a second inclined surface, which is close to and opposite to the first inclined surface when the groove and the protrusion are engaged.

[0013] Furthermore, the protruding portion may have a first plane including the starting point and parallel to the mold surface, and the groove portion may have a second plane that is close to and opposed to the first plane when the groove portion and the protruding portion are engaged.

[0014] Effects of the Invention

[0015] According to the present invention, a clamping die which is advantageous in extending the life can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of a terminal crimping device to which the crimping die according to each embodiment can be applied.

[0017] Figure 2 It is a perspective view of a lower mold constituting the clamping mold according to the first embodiment.

[0018] Figure 3 It is a plan view of the lower mold constituting the clamping mold according to the first embodiment.

[0019] Figure 4 It is a side view of the clamping die involved in the first embodiment.

[0020] Figure 5 is equivalent to Figure 3 A cross-sectional view of the clamping die cut along the VV portion.

[0021] Figure 6 is equivalent to Figure 5 A partial enlarged view of the lower mold of part VI.

[0022] Figure 7 This is a partial cross-sectional view showing the state of the lower mold and the upper mold before approaching.

[0023] Figure 8 This is a partial cross-sectional view showing the state of the lower mold and the upper mold during crimping.

[0024] Fig. 9 is equivalent to Figure 8 A partial enlarged view of the crimping portion of section IX.

[0025] Fig.10 It is a partial cross-sectional view showing the state of the lower mold and the upper mold after separation.

[0026] Fig.11 It is a perspective view of a lower mold constituting a clamping mold according to a second embodiment.

[0027] Fig.12 is equivalent to Fig.11 A cross-sectional view of the lower mold at the XI-XI portion.

[0028] Fig.13is equivalent to Fig.11 A cross-sectional view of the lower mold at part XII-XII. Specific implementation methods

[0030] Hereinafter, the pressing die according to each embodiment will be described in detail using the drawings. In addition, the dimensional ratios in the drawings are exaggerated for convenience of description and may be different from the actual ratios.

[0031] (First Embodiment)

[0032] Figure 1 It is a stereoscopic view of a terminal crimping device 1 that can adopt the clamping die 10 involved in the first embodiment. In addition, the terminal crimping device 1 can also adopt the clamping die 10 involved in the second embodiment instead of the clamping die 10 involved in the first embodiment. Below, for the purpose of explanation, the various directions related to the terminal crimping device 1 and the clamping die 10 are defined as follows. The X direction represents the front-to-back direction from the rear side to the front side. The Y direction represents the width direction perpendicular to the X direction on the horizontal plane. The Z direction represents the up-down direction from the bottom to the top. In addition, the X direction is sometimes expressed as "front" or "back". And, the Z direction is sometimes expressed as "up" or "down".

[0033] The terminal crimping device 1 forms a crimping portion 113 (see FIG. 1 ) by crimping the crimping forming portion 112 of the crimping terminal 110 onto the end of the electric wire 101. Figure 8 and Fig. 9 ), thereby manufacturing the electric wire 100 with a terminal.

[0034] The electric wire 101 has: a plurality of core wires 102 formed of a conductive metal such as copper or aluminum; (refer to Figure 7 as well as Fig. 9 );And a coating 103 formed of an insulating synthetic resin covering a plurality of core wires 102. At the end of the wire 101, the coating 103 is stripped and a portion of the core wire 102 is exposed to the outside. In addition, Figures 7 to 10 In each of the drawings, for convenience, a plurality of core wires 102 are depicted as a cross section of one component.

[0035] The crimp terminal 110 is formed of a conductive metal such as copper, aluminum or an alloy thereof and is plated with tin or chrome. The crimp terminal 110 is crimped to the core wire 102 which is exposed to the outside by peeling off the coating 103. The crimp terminal 110 has a connection portion 111 and a crimp forming portion 112.

[0036] The connection portion 111 is a cylindrical portion located on the front side in the X direction of the crimping terminal 110. The connection portion 111 is connected to a counterpart connection portion of a counterpart terminal, thereby electrically connecting the crimping terminal 110 and the counterpart terminal.

[0037] The crimping forming portion 112 is a cylindrical portion located at the rear side in the X direction of the crimping terminal 110. The crimping forming portion 112 has insertion holes 112a (see FIG. 112 ) extending in the X direction of the crimping forming portion 112 and through which the plurality of core wires 102 of the power supply wire 101 are inserted. Figure 7 ). In addition, a flange portion 112 b located at the front side of the crimping forming portion 112 and protruding radially outward from the outer peripheral surface of the crimping forming portion 112 may be connected to the crimping forming portion 112 .

[0038] The terminal crimping device 1 includes a base 11, a wire holding portion 12, a frame 13, a lower die 14, a movement restricting portion 15, an upper die 16, and a driving unit (not shown). The lower die 14 and the upper die 16 constitute a crimping die 10 according to the present embodiment.

[0039] The base 11 is a block-shaped structure such as a rectangular parallelepiped fixed to a work table on which the terminal crimping device 1 is placed.

[0040] The electric wire holding part 12 includes: a first holding part 12a fixed to the base 11 for placing the electric wire 101; and a second holding part 12b configured to freely approach and separate from the first holding part 12a in the Z direction, and capable of holding the electric wire 101 placed on the first holding part 12a. The first holding part 12a includes a groove 12c located in the center of the Y direction and extending in the X direction, and the electric wire 101 is arranged in the groove 12c to restrict the movement of the electric wire 101 in the Y direction. The electric wire holding part 12 first places the electric wire 101 on the first holding part 12a in a state where the second holding part 12b is separated from the first holding part 12a in the Z direction. Then, the electric wire holding part 12 makes the second holding part 12b approach the first holding part 12a in the Z direction, and finally clamps the electric wire 101 between the first holding part 12a and the second holding part 12b. In a state where the electric wire 101 is clamped by the first holding portion 12 a and the second holding portion 12 b , movement of the electric wire 101 in each of the X direction, the Y direction, and the Z direction is restricted.

[0041] The frame 13 is fixed to the base 11 and includes a frame main body 13 a and a frame support portion 13 b that supports the upper mold 16 so as to be movable in the Z direction relative to the frame main body 13 a .

[0042] Figure 2 It is a three-dimensional view of the lower mold 14. Figure 3 It is a top view of the lower mold 14. Figure 4 1 is a side view of the compaction mold 10 including the lower mold 14 and the upper mold 16. Figure 5 is equivalent to Figure 3 A cross-sectional view of the clamping die 10 cut at the position of the VV portion in FIG. Figure 4 and Figure 5 , the pressing die 10 is shown in a state where the crimping forming portion 112 is not yet sandwiched by the lower die 14 and the upper die 16 . Figure 6 is equivalent to Figure 5 A partial enlarged view of the lower mold 14 of part VI in FIG.

[0043] The lower die 14 is one of the pressing dies 10 as a pair of dies that sandwich and press the crimping forming portion 112 of the crimping terminal 110 together with the upper die 16 and is supported by the base 11. The lower die 14 is sometimes also called an "anvil". The lower die 14 has a lower die body 20 and a lower die concave portion 21.

[0044] The lower mold body 20 is a rectangular block, and the cross section on the horizontal plane is defined by the X direction and the Y direction. The lower mold body 20 has a lower mold surface 20a. The lower mold surface 20a is a mold surface on the lower mold 14 side that is opposite to the upper mold 16 and is close to the upper mold surface 30a when the lower mold 14 and the upper mold 16 are combined.

[0045] The lower mold concave portion 21 is located in the lower mold body 20 at the center of the lower mold surface 20a in the Y direction, and is formed to be grooved along the X direction. The lower mold concave portion 21 has a lower mold bottom surface 21a, and the width of the lower mold bottom surface 21a in the Y direction is set to be narrower than the opening width along the Y direction at the opening surface opened on the lower mold surface 20a. In addition, the lower mold concave portion 21 has a first inclined side surface 20b and a second inclined side surface 20c of a shape symmetrical to each other in the Y direction with the lower mold bottom surface 21a as a reference. One end of the first inclined side surface 20b is continuous with one end edge of the lower mold bottom surface 21a along the X direction, and the other end of the first inclined side surface 20b is continuous with the lower mold surface 20a. Similarly, one end of the second inclined side surface 20c is continuous with the other end edge of the lower mold bottom surface 21a along the X direction, and the other end of the second inclined side surface 20c is continuous with the lower mold surface 20a. The first inclined side surface 20 b and the second inclined side surface 20 c are inclined so as to be separated from the lower mold bottom surface 21 a along the Y direction as they move from the lower mold bottom surface 21 a toward the lower mold surface 20 a .

[0046] The lower mold setback 22 is located on the lower mold bottom surface 21a, and the crimping forming portion 112 of the crimping terminal 110 is placed thereon. In the lower mold setback 22, by crimping the crimping forming portion 112 to the end of the electric wire 101, the shape of the lower mold setback 22 is transferred to the crimping portion 113, and the lower portion 113a of the crimping portion 113 is formed (see Figure 8 and Fig. 9). The lower mold indentation portion 22 includes a lower mold central protrusion 22a and a pair of lower mold indentation bottom surfaces 22b. The lower mold central protrusion 22a is lower than the lower mold surface 20a in the Z direction, and is located in the center of the lower mold main body 20 in the Y direction, protruding in the crimping direction. Here, the crimping direction associated with the lower mold 14 is a direction from the bottom to the top along the Z direction. A pair of lower mold indentation bottom surfaces 22b are located on both sides of the lower mold central protrusion 22a in the Y direction, and are formed below the lower mold central protrusion 22a in the Z direction. One lower mold indentation bottom surface 22b is continuous with the first inclined side surface 20b at the first lower end 20d extending along the X direction. The other lower mold indentation bottom surface 22b is continuous with the second inclined side surface 20c at the second lower end 20e extending along the X direction. That is, the first lower end 20d and the second lower end 20e are two ends of the lower mold indentation portion 22 in the Y direction that are opposite to each other in the Y direction.

[0047] The lower die 14 has a lower die concave portion 23, a lower die convex portion 24, a lower die protrusion 25, and a lower die groove portion 26. The lower die concave portion 23 and the lower die convex portion 24 are adjacent to each other in the Y direction via the lower die concave portion 21 including the lower die setback 22.

[0048] The lower mold recess 23 is adjacent to the first lower end 20d in the Y direction and is formed from the lower mold surface 20a to the lower direction in the Z direction. The lower mold recess 23 has a bottom surface 23a, a first inner surface 23b and a second inner surface 23c that are opposite to each other in the Y direction, and a third inner surface 23d and a fourth inner surface 23e that are opposite to each other in the X direction. Here, among the multiple inner surfaces forming the lower mold recess 23, the first inner surface 23b is closest to the lower mold setback 22. Figure 3 As shown, the width W2 of the lower die recessed portion 23 in the X direction is greater than the width W1 of the lower die recessed portion 22 in the X direction.

[0049] The lower die protrusion 24 is adjacent to the second lower end 20e in the Y direction, and protrudes upward from the lower die surface 20a in the Z direction. It should be noted that since the lower die protrusion 24 can be regarded as a wall portion standing upright on the positive lateral side of the lower die indentation 22, the lower die protrusion 24 can be called a "lateral wall" or "pillar". The lower die protrusion 24 has a top end surface 24a, a first outer surface 24b and a second outer surface 24c opposite to each other in the Y direction, and a third outer surface 24d and a fourth outer surface 24e opposite to each other in the X direction. Here, among the multiple outer surfaces forming the lower die protrusion 24, the first outer surface 24b is closest to the lower die indentation 22. As shown in FIG. Figure 3 As shown, the width W3 of the lower die protrusion 24 in the X direction is greater than the width W1 of the lower die recessed portion 22 in the X direction.

[0050] The lower die protrusion 25 is a protrusion formed to be contained inside the lower die recess 23. When the lower die recess 23 and the upper die protrusion 34 are engaged, the lower die protrusion 25 is engaged with the upper die groove 36 formed in the upper die protrusion 34.

[0051] In this embodiment, a portion of the lower mold protrusion 25 is continuous with the first inner surface 23b. Here, the position of the lower mold protrusion 25 closest to the lower mold surface 20a is defined as the first starting point position 25b. In this case, the first starting point position 25b is located on the first inner surface 23b. Figure 6 As shown in FIG. 1 , when the depth from the lower mold surface 20 a to the lower mold setback bottom surface 22 b is defined as a depth D, the first starting point position 25 b is included in the height range corresponding to the depth D.

[0052] In addition, in this embodiment, if Figure 3 As shown, the lower die protrusion 25 is a block-shaped portion defined by a width W4 having a fixed value in the Z direction. Moreover, the lower die protrusion 25 is included in a width range corresponding to the width W1 of the lower die setback 22. That is, the width W4 of the lower die protrusion 25 is smaller than the width W1 of the lower die setback 22. In addition, the width W4 of the lower die protrusion 25 is set according to the width W5 of the upper die groove 36 described later.

[0053] Furthermore, in the present embodiment, the lower die protrusion 25 has a first lower die inclined surface 25a, which is an inclined surface that moves away from the first inner surface 23b as it moves from the first starting point position 25b toward the bottom surface 23a of the lower die recess 23. That is, the lower die protrusion 25 is integrally supported by the lower die recess 23 through the bottom surface 23a and the first inner surface 23b. Hereinafter, the inclination angle of the first lower die inclined surface 25a relative to the direction from the upper side to the lower side along the Z direction is defined as a first inclination angle θ1.

[0054] The lower die groove portion 26 is a groove portion formed in the lower die convex portion 24. When the upper die concave portion 33 is engaged with the lower die convex portion 24, the lower die groove portion 26 is engaged with the upper die protrusion portion 35 formed in the upper die concave portion 33.

[0055] In this embodiment, a portion of the lower die groove portion 26 is open at the first outer surface 24b. Here, the position closest to the lower die surface 20a in the lower die groove portion 26 is defined as the second starting point position 26b. In this case, the second starting point position 26b is located on the first outer surface 24b. Figure 6 As shown, the second starting point 26b is separated from the lower mold surface 20a in the Z direction in such a manner that the height dimension from the lower mold surface 20a to the second starting point 26b is substantially the same as the height dimension from the lower mold surface 20a to the first starting point 25b.

[0056] In addition, in this embodiment, the width of the lower mold groove portion 26 in the X direction is as follows: Figure 3 As shown in , it is defined by a width W5 which is a fixed value. Moreover, the lower die groove portion 26 is included in the width range corresponding to the width W1 of the lower die setback portion 22. That is, the width W5 of the lower die groove portion 26 is smaller than the width W1 of the lower die setback portion 22. In addition, the width W5 of the upper die groove portion 36 is set so that even if the upper die groove portion 36 is formed on the upper die convex portion 34, the strength of the upper die convex portion 34 is maintained to a certain extent.

[0057] Furthermore, in the present embodiment, the lower die groove portion 26 has a second lower die inclined surface 26a, which is an inclined surface that moves away from the first outer surface 24b as it moves from the second starting point position 26b toward the top end surface 24a of the lower die protrusion 24. In other words, the lower die groove portion 26 is open to the outside at both the top end surface 24a and the first outer surface 24b. Hereinafter, the inclination angle of the second lower die inclined surface 26a relative to the Z direction is defined as the second inclination angle θ2. When the upper die protrusion 35 is engaged with the lower die groove portion 26, the second lower die inclined surface 26a is close to and opposite to the first upper die inclined surface 35a. In this case, the size of the second inclination angle θ2 is substantially the same as the size of the first inclination angle θ1.

[0058] like Figure 1 As shown, the movement restricting portion 15 is located on the front side in the X direction relative to the lower mold 14. The movement restricting portion 15 has a restricting portion body 15a and a pair of flange receiving portions 15b.

[0059] The limiting portion body 15a is, for example, a rectangular block. A pair of flange receiving portions 15b are spaced apart in the Y direction and protrude upward from the upper surface of the limiting portion body 15a. By inserting the connecting portion 111 of the crimping terminal 110 between the flange receiving portion 15b on one side and the flange receiving portion 15b on the other side, the movement of the crimping terminal 110 along the Y direction is restricted. In addition, when the crimping forming portion 112 is placed on the lower mold retracting portion 22, the pair of flange receiving portions 15b contact the flange portion 112b of the crimping forming portion 112 in the X direction, thereby restricting the crimping terminal 110 from moving forward in the X direction.

[0060] The upper mold 16 is the side of the clamping mold 10 that is supported by the frame 13. In addition, the upper mold 16 is sometimes also called a "crimp". The upper mold 16 is supported by the frame support portion 13b and is opposite to the lower mold 14 in the Z direction. In addition, the upper mold 16 approaches and moves away from the lower mold 14 by moving the frame support portion 13b relative to the frame body 13a in the Z direction. Here, the crimping direction related to the upper mold 16 is the direction from the top to the bottom along the Z direction. The shape of the upper mold 16 is the shape of the lower mold 14 rotated 180° while maintaining parallelism with the YZ plane. That is, the main shape of the upper mold 16 is the same as the shape of the lower mold 14. However, there may be differences in the length in the Z direction and the like between the lower mold 14 and the upper mold 16.

[0061] In addition, the upper mold 16 has an upper mold body portion 30 and an upper mold recessed portion 31. The terminal portion of the upper mold body portion 30 has the same shape as the lower mold body portion 20, and its length in the Z direction is longer than that of the lower mold body portion 20. The mold surface located at the upper mold body portion 30 is the upper mold surface 30a. The upper mold recessed portion 31 has the same shape as the lower mold recessed portion 21, has an upper mold bottom surface 31a, and is opposite to the lower mold recessed portion 21 in the Z direction. The upper mold indentation portion 32 has the same shape as the lower mold indentation portion 22, and is opposite to the lower mold indentation portion 22 in the Z direction. The upper mold indentation portion 32 is formed by crimping the crimping forming portion 112 to the terminal of the electric wire 101, thereby transferring the shape of the upper mold indentation portion 32 to the crimping portion 113, thereby forming the upper portion 113b of the crimping portion 113 (see Figure 8 and Fig. 9 ). The upper mold indentation portion 32 also includes an upper mold central protrusion 32a and a pair of upper mold indentation bottom surfaces 32b. One upper mold indentation bottom surface 32b is continuous with the first inclined side surface 30b at a first upper end 30d extending along the X direction. The other upper mold indentation bottom surface 32b is continuous with the second inclined side surface 30c at a second upper end 30e extending along the X direction.

[0062] Furthermore, the upper die 16 has: an upper die concave portion 33, an upper die convex portion 34, an upper die protrusion 35, and an upper die groove portion 36. The upper die concave portion 33 is the same shape as the lower die concave portion 23, has a bottom surface 33a and a first inner surface 33b, and engages with the lower die convex portion 24 when approaching the lower die 14. The upper die convex portion 34 is the same shape as the lower die convex portion 24, has a top end surface 34a and a first outer surface 34b, and engages with the lower die concave portion 23 when approaching the lower die 14. In addition, the upper die convex portion 34 is regarded as a wall portion standing upright on the right lateral side of the upper die retracted portion 32, similarly to the lower die convex portion 24, and is therefore sometimes also referred to as a "lateral wall" or "pillar". The upper die protrusion 35 is the same shape as the lower die protrusion 25, and has a first upper die inclined surface 35a and a first starting point position 35b. The upper die groove portion 36 has the same shape as the lower die groove portion 26 and has a second upper die inclined surface 36 a and a second starting point position 36 b .

[0063] Here, the lower die convex part 24 including the lower die groove part 26 is fitted with the upper die concave part 33, so the shape of the lower die convex part 24 as a whole matches the shape of the upper die concave part 33 including the upper die protrusion 35. Similarly, the upper die convex part 34 including the upper die groove part 36 is fitted with the lower die concave part 23, so the shape of the upper die convex part 34 as a whole matches the shape of the lower die concave part 23 including the lower die protrusion 25. However, in order to prevent the lower die convex part 24 or the upper die convex part 34 from being unable to be removed after fitting, the width dimension of each part of the lower die convex part 24 and the upper die convex part 34 is set to be smaller than the width dimension of each corresponding part of the upper die concave part 33 or the lower die concave part 23, for example, by about 0.1 [mm].

[0064] Furthermore, the driving unit moves the frame support portion 13 b relative to the frame body 13 a in the Z direction, thereby moving the upper mold 16 closer to and farther from the lower mold 14 in the Z direction.

[0065] Next, basic operation of the terminal crimping device 1 including the crimping die 10 during crimping will be described.

[0066] Figure 7 This is a partial cross-sectional view showing the state of the lower mold 14 and the upper mold 16 before the crimping forming portion 112 of the crimping terminal 110 is placed on the lower mold retracted portion 22 of the lower mold 14 and the crimping forming portion 112 is crimped to the electric wire 101, that is, before the lower mold 14 and the upper mold 16 approach each other in the terminal crimping device 1. In addition, Figures 7 to 10 The cross-sectional views correspond to Figure 5 Figure cut at the same position.

[0067] Figure 8 It is shown that the upper mold 16 is Figure 7 The state shown is a partial cross-sectional view of the lower mold 14 and the upper mold 16 in a state where the lower mold 14 starts to approach the lower mold 14 and presses the crimp forming portion 112 to form the crimping portion 113 . Fig. 9 is with Figure 8 A partial enlarged view of the crimping portion corresponding to Section IX in FIG.

[0068] Fig.10 It is shown that the upper mold 16 is Figure 7 The state shown is a partial cross-sectional view of a state in which the finally formed crimping portion 113 exists on the lower die setback portion 22 of the lower die 14 after the separation from the lower die 14 has begun.

[0069] First, the operator inserts the plurality of core wires 102 in the electric wire 101 into the insertion holes 112a of the crimping forming portion 112. Figure 7As shown, the operator places the crimping forming portion 112 on the lower mold retracted portion 22 while inserting the plurality of core wires 102 into the insertion holes 112a, and places the electric wire 101 on the first holding portion 12a of the electric wire holding portion 12. Next, the operator brings the second holding portion 12b close to the first holding portion 12a, and causes the first holding portion 12a and the second holding portion 12b to clamp the electric wire 101.

[0070] Next, the operator drives the driving unit to move the upper mold 16 toward the lower mold 14. Figure 8 and Fig. 9 As shown, the upper die 16 approaches the lower die 14, and the crimping forming portion 112 is pressed (compressed) by the lower die retracted portion 22 and the upper die retracted portion 32. At this time, the crimping forming portion 112 is compressed in the Z direction and extends in the Y direction. Finally, the shapes of the lower die retracted portion 22 and the upper die retracted portion 32 are transferred to the crimping terminal 110, thereby forming the crimping portion 113. In this way, the terminal crimping device 1 can manufacture the wire 100 with the terminal in which the crimping terminal 110 and the wire 101 are integrated by crimping the core wire 102 inserted into the insertion hole 112a of the crimping terminal 110.

[0071] Then, the operator drives the driving unit again to move the upper mold 16 away from the lower mold 14. Fig.10 As shown, the upper mold 16 is separated from the lower mold 14. Then, the operator takes out the electric wire 100 with a terminal placed on the first holding portion 12a and the lower mold 14.

[0072] Next, the effect of the clamping die 10 will be described.

[0073] The pressing die 10 includes a lower die 14 and an upper die 16, which, when approaching each other in the vertical direction, crimp the crimping forming portion 112 of the crimping terminal 110 to the electric wire 101. The lower die 14 and the upper die 16 are each in a rectangular parallelepiped shape, and the cross section on the horizontal plane is defined by the front-to-back direction consistent with the axial direction of the crimping forming portion 112 and the width direction perpendicular to the front-to-back direction.

[0074] The lower die 14 has a lower die setback 22, which is provided in a lower die concave portion 21 formed on one side of the lower die surface 20a facing the crimping direction, so that the crimping forming portion 112 contacts the lower die setback 22 in a state along the front-back direction. The lower die 14 has a lower die concave portion 23, which is adjacent to the first lower end portion 20d, which is one end portion in the width direction of the lower die setback 22, and is formed from the lower die surface 20a in the direction opposite to the crimping direction. The lower die 14 has a lower die convex portion 24, which is adjacent to the second lower end portion 20e, which is the other end portion in the width direction of the lower die setback 22, and protrudes from the lower die surface 20a in the crimping direction. The lower die 14 has a lower die protrusion 25, which is formed in the lower die concave portion 23 so that a part of the lower die protrusion 25 is continuous with the first inner surface 23b closest to the lower die setback 22. Furthermore, the lower die 14 has a lower die groove portion 26 formed in the lower die convex portion 24 such that a portion of the lower die groove portion 26 is open at the first outer surface 24 b closest to the lower die setback portion 22 .

[0075] The upper mold 16 has an upper mold setback 32, which is provided in an upper mold concave portion 31 formed on one side of the upper mold surface 30a facing the crimping direction, so that the crimping forming portion 112 contacts the upper mold setback 32 in a state along the front-back direction. The upper mold 16 has an upper mold concave portion 33, which is adjacent to the first upper end 30d, which is one end in the width direction of the upper mold setback 32, and is formed from the upper mold surface 30a in the direction opposite to the crimping direction. The upper mold 16 has an upper mold convex portion 34, which is adjacent to the second upper end 30e, which is the other end in the width direction of the upper mold setback 32, and protrudes from the upper mold surface 30a in the crimping direction. The upper mold 16 has an upper mold protrusion 35, which is formed in the upper mold concave portion 33 in a manner that a portion is continuous with the first inner surface 33b closest to the upper mold setback 32. In addition, the upper die 16 has an upper die groove portion 36 formed in the upper die protrusion 34 so as to be partially open at the first outer surface 34 b closest to the upper die setback portion 32 .

[0076] The lower die protrusion 25 engages with the upper die groove 36 when the lower die recess 23 and the upper die protrusion 34 engage, and the upper die protrusion 35 engages with the lower die groove 26 when the upper die recess 33 and the lower die protrusion 24 engage.

[0077] Furthermore, the position of the lower mold protrusion 25 closest to the lower mold surface 20a, that is, the first starting point position 25b, is included in the height range corresponding to the depth D from the lower mold surface 20a to the lower mold setback bottom surface 22b of the lower mold setback portion 22. Similarly, the position of the upper mold protrusion 35 closest to the upper mold surface 30a, that is, the first starting point position 35b, is included in the height range corresponding to the depth D from the upper mold surface 30a to the upper mold setback bottom surface 32b of the upper mold setback portion 32.

[0078] Here, in the above example, the vertical direction corresponds to the Z direction, the front-back direction corresponds to the X direction, and the width direction corresponds to the Y direction. The crimping direction of the lower mold 14 corresponds to the Z direction, and the crimping direction of the upper mold 16 corresponds to the direction opposite to the Z direction.

[0079] First, according to the clamping die 10, when the lower die 14 and the upper die 16 are closest, the lower die retracted portion 22 and the upper die retracted portion 32 press the crimping forming portion 112 in the Y direction in a state of being clamped by the lower die convex portion 24 and the upper die convex portion 34, thereby forming the crimping portion 113. At this time, the lower die convex portion 24 and the upper die convex portion 34 use their respective first outer surfaces 24b and first outer surfaces 34b to restrict the crimping forming portion 112 from plastically deforming in a manner extending along the Y direction, thereby suppressing the generation of burrs on the crimping portion 113.

[0080] Here, as a comparative example, it is assumed that there is no lower die protrusion 25 and lower die groove 26 in the lower die 14, and no upper die protrusion 35 and upper die groove 36 in the upper die 16. In this case, in the lower die 14, since the lower die recess 23 is close to the first inclined side surface 20b continuous with the lower die setback 22, the thickness between the lower die recess 23 and the lower die setback 22 is thinner than other parts. Therefore, whenever the lower die setback 22 and the upper die setback 32 press the crimping forming portion 112 to form the crimping portion 113, stress is easily applied to this part of the lower die 14. In particular, according to the shape of the lower die setback 22, stress is easily concentrated on the corner portion 20d where the first inclined side surface 20b and the lower die setback bottom surface 22b are continuous in a cross manner. Such stress concentration on a specific part may also cause fatigue failure of the lower die 14 earlier, so it is not preferred. In this regard, in the upper die 16 , since the upper die recess 33 is close to the first inclined side surface 30 b continuous with the upper die setback 32 , the same also applies to the portion between the upper die recess 33 and the upper die setback 32 which is thinner than other portions.

[0081] In contrast, in the clamping die 10 according to the present embodiment, a lower die protrusion 25 is formed in the lower die recess 23, and a portion of the lower die protrusion 25 is continuous with the first inner surface 23b closest to the lower die setback 22. In addition, the first starting point 25b of the lower die protrusion 25 is included in the height range corresponding to the depth D from the lower die surface 20a to the lower die setback bottom surface 22b. That is, as Fig. 9 As shown in FIG. 1 , the distance in the Y direction from the first lower end portion 20d to the lower die recess 23 is thicker than when there is no lower die protrusion 25. Therefore, the thick wall portion including the lower die protrusion 25 can be used as a reinforced portion to Fig. 9 The stress concentration generated at the first lower end 20d is relieved by transferring the stress in the direction indicated by the hollow arrow in the figure, thereby further delaying the time of fatigue failure in the lower die 14. In addition, the upper die protrusion 35 formed in the upper die recess 33 also functions in the same manner as the lower die protrusion 25.

[0082] As described above, according to this embodiment, it is possible to provide the clamping die 10 that is advantageous in extending the life of the clamping die 10. In addition, by extending the life of the clamping die 10, the consumption cost of the clamping die 10 can be further reduced.

[0083] Furthermore, in the compacting die 10, the lower die protrusion 25 may be included in a width range corresponding to the width W1 of the lower die setback 22 in the front-rear direction. Similarly, the upper die protrusion 35 may be included in a width range corresponding to the width W1 of the upper die setback 32 in the front-rear direction.

[0084] According to the clamping die 10, for example, the lower die protrusion 25 is always opposed to the lower die setback 22 in the width direction, and is therefore more susceptible to stress generated from the lower die setback 22 side, resulting in the life of the lower die 14 being more reliably extended. This is also true for the upper die protrusion 35.

[0085] Furthermore, according to the clamping die 10, the width W5 of the upper die groove portion 36, which is the engagement object of the lower die protrusion 25, is also included in the width range corresponding to the width W1 of the upper die setback portion 32. Therefore, even if the upper die groove portion 36 is formed in the upper die protrusion 34, the strength of the upper die protrusion 34 can be maintained, and the surface area of ​​the first outer surface 34b of the upper die protrusion 34 can be ensured to a degree that does not hinder the suppression of the generation of burrs at the crimping portion 113. This is also the case in that the width W5 of the lower die groove portion 26, which is the engagement object of the upper die protrusion 35, is also included in the width range corresponding to the width W1 of the lower die setback portion 22.

[0086] Furthermore, in the clamping die 10, the lower die protrusion 25 may also have a first lower die inclined surface 25a as a first inclined surface, and the first lower die inclined surface 25a moves away from the first inner surface 23b closest to the lower die setback 22 as it moves from the first starting point position 25b toward the bottom surface 23a of the lower die recess 23. The lower die groove 26 may also have a second inclined surface, that is, a second lower die inclined surface 26a, which is close to and opposite to the first upper die inclined surface 35a when the upper die protrusion 35 is engaged. Similarly, the upper die protrusion 35 may also have a first upper die inclined surface 35a as a first inclined surface, and the first upper die inclined surface 35a moves away from the first inner surface 33b closest to the upper die setback 32 as it moves from the first starting point position 35b toward the bottom surface 33a of the upper die recess 33. The upper die groove portion 36 may include a second upper die inclined surface 36 a which is a second inclined surface that is close to and faces the first lower die inclined surface 25 a when the lower die protruding portion 25 is engaged.

[0087] According to the pressing mold 10, as Fig. 9 As shown in the figure, the lower die protrusion 25 and the upper die protrusion 35 are provided in accordance with the stress transmission direction indicated by the hollow arrow in the figure. Therefore, the size of the lower die protrusion 25 can be set to the minimum required limit, and the size of the upper die groove 36 engaged with the lower die protrusion 25 can also be set to be smaller, so that the strength of the upper die convex part 34 can be more easily ensured. This is the same in that the size of the upper die protrusion 35 can be set to the minimum required limit.

[0088] Here, according to the conditions such as the shape of each part such as the lower mold retracted part 22 or the lower mold concave part 23, Fig. 9 When the direction of the transferred stress as indicated by the hollow arrow in is known, the magnitudes of the first inclination angle θ1 and the second inclination angle θ2 may be set based on the direction.

[0089] (Second Embodiment)

[0090] In the clamping die 10 according to the first embodiment, the lower die protrusion 25 and the upper die protrusion 35 have inclined surfaces such as the first lower die inclined surface 25a and the first upper die inclined surface 35a, respectively, in the lower die 14 and the upper die 16. However, in the clamping die 10, the shapes of the protrusions formed in the lower die 14 and the upper die 16 and the corresponding grooves are not limited to the shapes of the lower die protrusion 25, the lower die groove 26, the upper die protrusion 35 and the upper die groove 36, and may have the following shapes, for example.

[0091] Fig.11 It is a perspective view of the lower mold 14 constituting the clamping mold 10 according to the second embodiment. Fig.12 is equivalent to Fig.11 A cross-sectional view of the lower mold 14 taken along the line XI-XI in FIG. Fig.13 is equivalent to Fig.11 1-1 is a cross-sectional view of the lower mold 14 at the XII-XII portion in the figure. In addition, as in the case of the first embodiment, the shape of the upper mold 16 of the second embodiment is the same as the shape of the lower mold 14, so the description is omitted. In addition, regarding the various parts of the lower mold 14 in the second embodiment, the parts with the same shape as the parts of the lower mold 14 in the first embodiment are marked with the same reference numerals, and the description is omitted.

[0092] In the lower die 14 of the present embodiment, a lower die protrusion 27 is formed in the lower die concave portion 23 instead of the lower die protrusion 25 of the first embodiment, and a lower die groove 28 is formed in the lower die convex portion 24 instead of the lower die groove 26 of the first embodiment.

[0093] At least a portion of the lower die protrusion 27 is continuous with the first inner surface 23b. In addition, the first starting point position 27b in this case is also included in the height range corresponding to the depth D. Furthermore, the width of the lower die protrusion 27 in the X direction is also defined by the width W4 as a fixed value, similar to the lower die protrusion 25.

[0094] On the other hand, in the present embodiment, the lower die protrusion 27 has a first lower die plane 27a including a first starting point position 27b and parallel to the lower die surface 20a, instead of the first lower die inclined surface 25a in the lower die protrusion 25. Furthermore, in the present embodiment, the lower die protrusion 27 is integrally supported by the lower die recess 23 through three surfaces, namely, the bottom surface 23a, the first inner surface 23b, and the second inner surface 23c.

[0095] A portion of the lower die groove portion 28 is open at least at the first outer surface 24b. In addition, the second starting point 28b in this case is also separated from the lower die surface 20a in the Z direction in such a way that the height dimension from the lower die surface 20a to the second starting point 28b is substantially the same as the height dimension from the lower die surface 20a to the first starting point 27b. Moreover, the width of the lower die groove portion 28 is also defined by a fixed value of width W5 as in the lower die groove portion 26.

[0096] On the other hand, in the present embodiment, the lower die groove portion 28 has a second lower die plane 28a instead of the second lower die inclined surface 26a in the lower die groove portion 26, and the second lower die plane 28a is close to and opposite to the second upper die plane 38a when the lower die groove portion 28 is engaged with the upper die protrusion 37. Furthermore, the lower die groove portion 28 is open to the outside at three surfaces, namely, the top end surface 24a, the first outer surface 24b, and the second outer surface 24c.

[0097] Thus, in the clamping die 10, the lower die protrusion 27 may also have a first plane including the first starting point 27b and parallel to the lower die surface 20a, namely, a first lower die plane 27a. The lower die groove 28 may also have a second plane close to and opposite to the second upper die plane 38a when the upper die protrusion 37 is engaged. Similarly, the upper die protrusion 37 may also have a first plane including the first starting point 37b and parallel to the upper die surface 30a, namely, a first upper die plane 37a. The upper die groove 38 may also have a second plane close to and opposite to the second lower die plane 28a when the lower die protrusion 27 is engaged.

[0098] According to this embodiment, the same effect as the clamping die 10 involved in the first embodiment is achieved. On the other hand, according to this embodiment, for example, the lower die protrusion 27 can be made thicker in the width direction along the Y direction than the lower die protrusion 25 in the first embodiment, so that stress concentration can be further alleviated. This is also the same for the upper die protrusion 37 provided in the upper die concave portion 33 of the upper die 16.

[0099] In addition, according to the present embodiment, for example, the width of the lower die protrusion 27 in the front-to-back direction can be made the same as the width W4 of the lower die protrusion 25 in the first embodiment. Therefore, as in the case of the lower die protrusion 25, the surface area of ​​the first outer surface 34b of the upper die protrusion 34 can be ensured to a degree that does not hinder the suppression of the generation of burrs at the crimping portion 113. In addition, even if the volume of the lower die protrusion 27 increases compared to the volume of the lower die protrusion 25, the increase in the size of the upper die groove 36 engaged with the lower die protrusion 27 can be suppressed to be small, so the strength reduction of the upper die protrusion 34 can be further suppressed.

[0100] It should be noted that, in the above description, the pressing die 10 used in the terminal crimping device 1 is exemplified, but the structure or shape of the pressing die 10 can also be used in a crimping tool.

[0101] Several embodiments of the present invention have been described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments and their variations are included in the scope and subject matter of the invention, and are included in the invention described in the claims and the scope of their equivalents.

Claims

1. A compacting die, characterized in that: The invention comprises a lower die and an upper die, wherein when the lower die and the upper die approach each other in the vertical direction, the crimping forming portion of the crimping terminal is crimped to the electric wire, The lower die and the upper die are each a rectangular parallelepiped whose cross section on a horizontal plane is defined in a front-to-back direction and a width direction perpendicular to the front-to-back direction, and the front-to-back direction coincides with the axial direction of the crimping forming portion. The lower die and the upper die respectively have: a retracted portion, the retracted portion being arranged in a concave portion, the concave portion being formed on one side of the mold surface facing the crimping direction, the retracted portion being in contact with the crimping forming portion in a state where the crimping forming portion is along the front-rear direction; a recessed portion, the recessed portion being adjacent to one end portion of the indented portion in the width direction and being formed from the mold surface in a direction opposite to the crimping direction; a convex portion, the convex portion being adjacent to the other end portion of the indented portion in the width direction and protruding from the die surface in the crimping direction; a protrusion formed on the recessed portion in a manner that a portion of the protrusion is continuous with an inner surface closest to the retracted portion; as well as a groove portion formed in the convex portion in a manner that a portion of the groove portion is open at an outer surface closest to the retracted portion, When the concave portion of the lower die is engaged with the convex portion of the upper die, the protruding portion of the lower die is engaged with the groove portion of the upper die. When the concave portion of the upper die is engaged with the convex portion of the lower die, the protruding portion of the upper die is engaged with the groove portion of the lower die. The starting point position of the protruding portion, which is the position closest to the mold surface, is included in a height range corresponding to the depth from the mold surface to the bottom surface of the recessed portion.

2. The pressing die according to claim 1, characterized in that: The protruding portion is included in a width range corresponding to the width of the setback portion in the front-rear direction.

3. The pressing die according to claim 1 or 2, characterized in that: The protruding portion has a first inclined surface that is spaced away from the inner surface closest to the recessed portion as it moves from the starting point toward the bottom surface of the recessed portion. The groove portion has a second inclined surface, and the second inclined surface is close to and faces the first inclined surface when the groove portion is engaged with the protruding portion.

4. The pressing die according to claim 1 or 2, characterized in that: The protrusion has a first plane including the starting point and parallel to the mold surface. The groove portion has a second plane that is close to and faces the first plane when the groove portion is engaged with the protruding portion.

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